Preparation of 2-Amino-4H-5,6-dihydro-1,3-selenazin-4-ones by Reaction of N,N-Unsubstituted Selenoureas with α,β-Unsaturated Acid Chlorides

2-Dialkylamino-4 H-5,6-dihydro-1,3-selenazin-4-ones were obtained by the reaction of N,N-unsubstituted selenoureas with α,β-unsaturated acid chlorides at room temperature.